These Antique buttons are unusual and can be used in making period blouses or dress or just left on their antique cards to look at.
Size of the Green Mermaid Pearls made in USA  are 14mm in width
Better Buttons value pack Tacoma Button co. white Pearl cufflink button size are 10mm.
Czecho Slovakia La Mode Fashion light purple celluloid Buttons are 8mm in size 
3 Jewel tone gold and pink made in Germany buttons size are 15mm.
Lucky Day Genuine Pearl Buttons size are 9mm. 
2 Cards of Lady Washington yellow Pearls size 10mm in size.